--- utils.h.original	2018-11-24 06:28:03.854889427 +0000
+++ utils.h	2018-11-24 06:28:26.038134954 +0000
@@ -1,3 +1,4 @@
+#include <sys/types.h>
 #include <stdlib.h>
 #include <endian.h>
 #include <stdio.h>
